Drum structure with cooling means



May 1950 N. s. BORCH DRUM STRUCTURE WITH COOLING MEANS Filed July 31, 1947 ATTORNEYf Patented May 9, 1950 PATENT DRUM STRUCTURE WITH COOLING MEANS Niels lSofuswBonclr', Gopenha'gen, Denmark,. as-

.sigmor.-.to..F. vL..-Smidth 851 00., Newv York,,N. Y"

acorpnration oil-New Jersey Application Jul -3:1, 1947, Serial .No. 765N ImDenmark August 21, 1942 Section-.1, PublieLaw 690, AugustS, [1946 Patent .exp'ires August-2'1, 1962 "as a rotary: kiln will, accordingly; be 'illustrated and described for purposes of-exp'lanation.

At the .-;presentqtime; itxisrcommon practice to cool portions of rotary kilnsby spraying them .with water.v supplied by a pumpan'ountednear the. kiln. This methodof' cooling is objection- :a'ble; because it is ineflicientandmeans must be .proyidedior collecting the watensprayedqonthe kiln and for carrying oil the vapor. .A'lso the surfaces on which the water issprayed llarelsub- 'ject to corrosion.

The present invention is directed to the provision of a drum structure which includes a section requiring cooling, and means for cooling the section efficiently and without loss of the cooling fluid. According to the invention, the section of the drum to be cooled is jacketed and cooling fluid is circulated through the jacket by means of a motor driven pump mounted on the outside of the drum. The fluid, which has passed through the jacket of the section is then circulated through a cooler, which may take the form of a coil and may dip into a cooling bath as the drum rotates. With such a construction, all parts of the system through which the fluid circulates are mounted on the drum to move therewith, so that it is not necessary to provide couplings between stationary and moving parts. The cooling system preferably includes a pressure gauge and a safety valve, so that damage resulting from the development of abnormal pressure may be avoided. Also, the system includes means for permitting expansion of the cooling fluid as it becomes heated.

For a better understanding of the invention reference may be made to the accompanying drawing, in which the single figure discloses an embodiment of the invention in the form of a, rotary kiln,,having a cooled section at the discharge end.

The kiln installation disclosed in the drawing 2. includes-a metal shell l of conventional construe 'tion and having the usual ceramic lining; "The she'll-is provided with a plurality of tires 2, -w hich "run on rollers or slide *shoes 3 mounted on'a base 4, and the shell is driven by any suitablemeans, 'suchas a girth gear meshing with a di'iving pin- The" ring section 5 of the kiln at the discharge end becomes highly heated in. operation;;and;- in order to protect this section, -it"is 'jacketed and 'a coolingfluid, indicated at 6 is passed through 'the -interior thereof. The cooling fluid is-supp'lieii to'the interior of "the jacketby a pump driven by a motor 8-; the pumpand motorbeingm'ounted on the outer surface of theshell'; C'urrentis' supplied to the motor throughrsliprings 91mcircling the shell and carried by an insulating mounting; Brushes I'D mounted 'at any 1 suitable point adjacent the-kiln bear upon-the rings and are-connected through lines ilto a source' -o'f power. The terminals of the motor areconnect ed'to therings at! 2' by lines l3'.

Thecool-ing fluid leaves the jacket of "ring 5 through'apipe ["4 containing a 'safetyyalve li,

and is cooledby passage-"through acoil f6, which encircles the-"drum and isheld spaced'therefrom on supports IT. The coil is connected by a pipe [8 to an expansion tank I9, from which the pipe 20 leads to the intake of the pump. A pressure gauge 2! is mounted in pipe 20 to indicate the pressure of the fluid in the system.

The travel of the cooling fluid through the coil l6 lowers the temperature thereof but, if desired, the fluid may be further cooled by causing the coil to pass through a cooling bath as the kiln rotates. For this purpose, a tank 22 is mounted on base 4 beneath the kiln, in such position that the coil I6 enters the tank. Coolin fluid 23 is then circulated through the tank during the operation of the kiln.

With the drum structure described, the outlet ring 5 may be readily maintained within desired temperature limits by continuous circulation of the cooling fluid therethrough and through the cooler. The cooler may be mounted at any convenient place along the kiln and is preferably disposed at a distance from the hot zone thereof. During the rotation of the kiln, the pump operates continuously and heat is abstracted from the coolin fluid either by radiation from the coils of the cooler or by causing the coils to dip within the cooling bath in tank 22. The safety valve prevents the development of excess pressure in the cooling system, resulting, for example, from failure of the pump motor, and the pressure gauge may, if desired, be of the type, which includes alarm means to warn the attendant of the development of undesirable pressure.

I claim 1. A drum'structure, which comprises a hollow shell mounted for movement and having a jacketed section, and fluid-tight means for circulating a, cooling fluid through the jacket, including a motor driven pump mounted on the outside of the shell and having its outlet connected to the jacket, a cooler for the fluid mounted on the outside of the shell and spaced therefrom and connected to the jacket and to the pump intake, and a cooling bath into which the cooler dips as the shell moves.

2. A drum structure which comprises a hollow shell mounted for rotary movement and having a jacketed section, and fluid-tight means for circulating a cooling fluid through the jacket, including a motor driven pum mounted on the outside of the shell and having its outlet connected -to the jacket, and a cooling coil mounted on and spaced from the outside of the shell to encircle the shell and connected to the jacket and to the pump intake.

3. A drum structure which comprises a hollow shell mounted for rotary movement and having a jacketed section, and fluid-tight means for circulating a cooling fluid through the jacket, in-

cluding a motor driven pump mounted on the outside of the shell and having its outlet connected to the jacket, a cooling coil mounted on and spaced from the outside of the shell to encircle the shell and connected to the jacket and to the pump intake, and a cooling bath into :1.

which the coil dips as the shell rotates.

4. A drum structure, which comprises a hollow shell mounted for rotary movement and having a jacketed section, and fluid-tight means for circulating a cooling fluid through the jacket, including a motor-driven pump mounted on the outside of the shell and having its outlet connected to the jacket, a cooling coil mounted on and spaced from the outside of the shell to encircle the shell and connected to the jacket,

means including an expansion tank for connecting said cooling coil to the pump intake, and a cooling bath into which the coil dips as the shell rotates.

5. A drum structure, which comprises a hollow shell mounted for rotary movement and having a jacketed section, and fluid-tight means for circulating a cooling fluid through the jacket, including a motor-driven pump mounted on the outside of the shell and having its outlet connected to the jacket, a cooling coil mounted on and spaced from the outside of the shell at a point thereon remote from the jacket to encircle the shell, said cooling coil being connected to the jacket, means including an expansion tank for connecting the cooling coil to the pump intake, and a cooling bath into which the coil dips as the shell rotates.

6. A drum structure, which comprises a hollow shell mounted for rotary movement and having a jacketed section, and fluid-tight means for circulating a cooling fluid through the jacket, including a motor-driven pump mounted on the outside of the shell and having its outletv connected to the jacket, a cooling coil spaced from and mounted on the outside of the shell to encircle the shell, a connection including a safety valve between the coil and the jacket, means including an expansion tank and a fluid-pressure indicator for connecting the cooling coil to the pump intake, and a cooling bath into which the coil dips as the shell rotates.

NIELS SOFUS BORCH.

REFERENCES CITED The following references are of record inthe file of this patent:

UNITED STATES PATENTS- Number Name Date 96,206 Danks Oct, 26, 1869 159,849 Sellers Feb. 16, 1875 283,098 Gore Aug. 14, 1883 1,209,331 Ramsay Dec. 19, 1916 1,238,394 Eldred Aug. 28, 1917 1,863,437 Collier June 14, 1932 

